Question

define radioactive isotopes​

Answer 1

Answer:

If an isotope has an unstable nucleus that breaks down to emit radiation, then these are what we call radioactive isotopes, also known as radioisotopes.

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Answer 2

Answer:

Heya here's your answer

The isotopes which are unstable (due to the present of extra neutrons in the nuclei) and emit various types of radiations are called radioactive isotopes.